1) Shadows are cast on an opaque ____________. 2) The _____________ of a shadow of an object depends on its orientation in front of a light source. 3) Light travels in a _____________ line. 4) What is an important property of a screen for a shadow to be cast on it? 5) A device used by ancient people to tell time. 6) The shape of a shadow depends on the ______________ of an object. 7) When an object is nearer to a light source, the shadow is ___________. 8) When an object is further away from a light source, the shadow is ___________. 9) Penumbra receives ______________ light from a light source. 10) Shadows are cast on an opaque _____________. 11) A shadow is formed __________ an object. 12) The lighter part of a shadow. 13) The darkest part of a shadow.  14) How do shadows are formed? 15) A _____________ is a dark area where light is blocked by an opaque object. 16) Light cannot pass through ____________ objects.

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